t_event.c

TMS320F2812的C++ examples 各个模块的程序

/*************************************************************************
* $RCSfile: t_event.c,v $
* $Revision: 1.18 $
* $Date: 2001/03/19 16:58:09 $
* Copyright (c) 1997-2000 Texas Instruments Incorporated
*
* Target Event Example:
*____________________________________________________________________
* - Sends 3 events to the host:
*      - boiling  (event without data)
*              - this event is triggered whenever the critical
*                temperature of boiling is reached.
*      - freezing (event without data)
*              - this event is triggered whenever the critical
*                temperature of freezing is reached.
*      - read_gauge (event with data)
*              - this event is triggered at regular intervals when a
*                temperature sample is taken.
* - Events without data are logged via a call to RTDX_Log_Event().
* - Events with data are logged via a call to RTDX_Log_Event_Data().
*
* - The program completes after 100 samples have been taken.
*
* - This TARGET example shows:
*              - the use of Event Classes.
*              - how data can be recorded with the event.
*************************************************************************/
#include <stdio.h>              /* fprintf(), puts()        			*/
#include <stdlib.h>             /* abort()                  			*/
#include <rtdx.h>               /* RTDX Target Interface                */
#include <rtdx_evt.h>           /* RTDX Target Event Interface          */
#include "target.h"             /* TARGET_INITIALIZE()      			*/

/* Define critical temperatures (celcius)                           	*/
#define BOILING                 100
#define FREEZING                0
#define MIN_TEMP                -30
#define MAX_TEMP                +130

#define NUMBER_OF_SAMPLES       100

/*************************************************************************
* Internal Function Prototypes & Data structures
*************************************************************************/
void read_temperature(void);

/* Define classes of events                                         	*/
#define Critical_Temp_Class     0x0001  /* critical temp. class	    	*/
#define Sample_Temp_Class       0x0002	/* sample temp. class       	*/

/* Declare events & give class                                      	*/
RTDX_event boiling              = { Critical_Temp_Class };
RTDX_event freezing             = { Critical_Temp_Class };
RTDX_event read_gauge           = { Sample_Temp_Class };

typedef enum { FALSE, TRUE } BOOL;


/*************************************************************************
* The main application.
* - read temperature gauge in a loop until all samples taken.
*************************************************************************/
void main( void )
{    
    register unsigned Samples = NUMBER_OF_SAMPLES;

    /* Target initialization for RTDX                                   */
    TARGET_INITIALIZE();
    
    /* Loop until "NUMBER_OF_SAMPLES" are taken...                      */
    do { 
        read_temperature();     /* Check temperature "sensor"           */
    } while( Samples-- > 0 );
    
    puts("\nProgram Completed!");
}


/*************************************************************************
* Simulate a temperature control by linearly changing the
* temperature from BOILING to FREEZING and back
*************************************************************************/
void read_temperature(void)
{
    static int temp = 50;	    /* Initial temperature                  */
    static int increment = 10;  /* Temperature increment                */
    
    /* Log temperature sample                   */
    if ( !RTDX_Log_Event_Data( &read_gauge, &temp, sizeof temp) ) {
        fprintf(stderr, "\nError: RTDX_Log_Event_Data() failed!\n");
        abort();
    }
    
    /* Check for critical temperatures                                  */
    if( (temp >= BOILING) || (temp <= FREEZING) ) {
        
        /* Determine which critical temperature.                        */
        RTDX_event *pEvent;
        if ( temp >= BOILING ) {
            pEvent = &boiling;
        } else if ( temp <= FREEZING ) {
            pEvent = &freezing;
        }
        if ( RTDX_Log_Event(pEvent) ) {
            /* Disable critical event class                             */
            /* - disables future critical events so only appears once.  */
            RTDX_Disable_Event_Class( Critical_Temp_Class );
        } else {
            fprintf(stderr, "\nError: RTDX_Log_Event() failed!\n");
            abort();
        }
        
    } else {
        /* Temperature no longer outside critical limits.               */
        /* - Re-enable critical event class to re-enabling future       */
        /*   critical events to appear again.                           */
        RTDX_Enable_Event_Class( Critical_Temp_Class );
    }
    
    /* Wait for data transfer                                           */
    while ( RTDX_writing != NULL ) {
#if RTDX_POLLING_IMPLEMENTATION
        RTDX_Poll();            /* Call Poll to do data transfer        */
#endif
    }
    
    if( (temp <= MIN_TEMP) || (temp >= MAX_TEMP) ) {
        increment *= -1;        /* Reverse increment direction          */
    }
    temp += increment;          /* Change temperature                   */
    
}